锅炉“四管”泄漏一直是影响火电厂安全生产、稳定运行的一大忧患。
Leakage of "Four Tube" in boiler is always the major hidden peril for safety operation of fossil-fired power plant.
结果，这些国家的社会安全保障系统的存在能力面临严重忧患。
As a consequence, these countries are facing serious concerns about the viability of social security systems.
结果，这些国家的社会安全保障系统的存在能力面临严重忧患。
As a consequence, these countries are facing serious concerns about the viability of social security systems.
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